Optical projecting apparatus.



F. McMlL-LAN.

OPTICAL PBOJECTING APPARATUS.

APPLICATION FILED lULY13, 191s. RENEWED MAY 14. I919.

Patented Dec. 30,1919. 3 SHEETS-SHEET l.

F. McMILLAN.

OPTICAL PROJEGTING APPARATUS.

APPLICATION FILED IULY13, 191a. RENEWED MAY 14. I919.

1 26,408. V Patented Dec. 30; 1919.

3 SHEETS-SHEET 2- I I, I I

A I l l I l I I u l l 1 I I l l l l l l l F. McMlLLAN.

OPTICAL PROJECTING APPARATUS. APPLICATION FILED JULY 13, I918. RENEWED MAY 14. I919 1,32 ,40 Patented Dec. 30,1919.

' 3 SHEETS-SHEET 3. I

om'rnn STATES PATENTOFFIOE.

FRANK 'MGMILLAN,

,NATIONAL DROP HEAD PROJECTOR COMPANY,

,PORATION OF WISCONSIN. 1

OPTICAL PBOJECTING APPARATUS.

Specification of Letters Patent.

OF GLENELLYN, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

OF POND DU LAC, WISCONSIN, COR- Patented Dec. 30, 1919.

Application filed July 13, 1918, Serial No. 244,708. Renewed May 14, 1919. Serial No. 297158..

To all whom it may concern:

Be it known that I, FRANK McMnmAN, a, citizen of the United States of America, and a resident of Glenellyn, in the county of Dupage, State of Illinois, have invented tain new and useful Improvements in cal Projecting Apparatus, of which the following is a specification. 4

This invention relates to that type-of op,- tical projecting apparatus in which are as sociated a stereoptioon and a motion picture machine arranged with their respective optioal centers in approximately'parallel relation, and having a single illuminating means capable of adjustment in a plane transverse to-said optical centers so as to afford illumination to one or the other of the aforesaid stereopticon or motion picture so that in a final folded condition of parts.

a very compact and readily transportable structure is provided, all as will hereinafter more full appear. Y

In the accompanying drawings Figure 1, is a side elevation, with parts broken away and in section, illustrating the general formation and combination of parts in the preferred form of the present invention. I

Fig. 2, is an enlarged detail central lon- 'tudinal sectlon of the'upper rear portion of the main casing and associated lamp house and condenser lenses of the present structure.

Fig. 3 is a transverse sectional elevation, on the l ne X Flg. 2, illustrating thecer- Optilamp house and condenser lenses of the struc ture.

Figs. 4:, 5 and 6, are detailhorizontal sections on l1nesX.-X, X and X* Fig. 3, respectively.

Like reference numerals indicate l ke parts in the several views.-

Referring to the drawings, 1 designates 'the main inclosing casing of the present structure, preferably of the rectangular shell -form shown. In the present improvement a portion 2 of the front end or wall of the casing 1 is. formed separate from the main body of said casing and is adjustably connected to said main body, preferably in a hinged manner as shown, 'and constitutes the supporting means foi the film feeding mechanism and the associated objective of the motion picture portion of the apparatus, while the rear wall 3 ofsaid casing 1 is formed with an opening or passage adapted to receive the lamp house and condenser lenses, hereinafter described in detail.

4 designates a latch mechanism for holding the hinged portion 2 aforesaid. in a closed and operative position.

In its detail construction and arrangement of parts the main casing 1 is similar to the main casing and accessories described and claimed in my companion application for Letters Patent, Serial No. 244,707, and

accordingly a- V 5 designates portions of a structural iron skeleton supporting frame adaptedto afi'ord strength and stability vto the inclosing walls of the casing 1, and the parts carried thereby.

, 6 and 7 designate counterpart reel casings or magazines of a cup form, the inner and closed ends of Which are disposed in spaced relation transversely, while their outer open ends are secured by marginal flanges to the respective side walls of the main casing 1. The space between said magazines afiords" a passage for the light beams from the source ofillumination, a containing space for the outer member 8 of the stereoptlcon lens system of the present structure, and a receiver for the lamp house and the asso ciat ed 'casing carrying thecondenser lenses of the apparatus hereinafter more fully described.

' 9 designates one of the doors, which form outer closures fcTr the magazines 6' and 7, .pivotally-secured tothe main casing 1 b hinges 10, as shown in Fig. 1. I

11.designates the carryingshaft of the film take up reels of the "machine, the detail construction and arfilm supply and rangement of which are. set forth and claimed in av companion applicationffor Letters Patent, Serial'No. 244,7 96.

12designates' a pulley mounted on the central portion of the reel carrying shaft 11 and having endless belt connection-l3 with the film feeding mechanism of the machine. I

v 14 designates the primary driving shaft of the film feeding mechanism heretofore referred to, provided with a friction orother suitable driven .wheel15 adapted for operative engagement with a companion drive= wheel or pinion on the shaft of an operating motor'located in the aforesaid space between the magazine 6 and 7, as setforth in detail in my aforesaid application, Serial No. 244,7 96. 16 designates the objective of'the motion picture mechanism heretofore referred to,

andwhich is mounted in associated relation to the film feeding mechanism on the aforesaid hinged front portion 2 of the main oasing 1, and adapted to. swing downward along with such-portion 2 and with the anisms;

film feeding mechanism, when the apparatus isadjusted to the position illustrated in .F1g.. 1, for effecting a" stereopticon exhibition. The described arrangement is adapted to {provide aclose and compact arrangement of the respective optical centers of the stereopticon and motion picture mech- Thelens 8 heretofore referred to as constitutingthe objective or forward member ofthe stereopticon lens system of the present apparatus,*is arranged centrally in the ,main casing 1- and made adjustable longitudinally therein, by its holder 17 arranged for sliding movement in a longi- .tudinal slot 18 in the top wall of the main casing, as illustrated more particularly in Fig. 2. In the present construction the op-- tical center of the lens-8; is in a plane a discure tance above the-plane which the optical center of the motion picture objective" 1 6 aforesaid, is arranged.

19 designates ap'air of guideways, pref-' erabl. ofthe tubular type shown,'and sein transverse spaced relation and in a longitudinal direction to the inner walls of the vpair of magazines 6, 7 above described.

20 designates sliding bars or rods 'movmg .in the aforesaid slideways 19, and

{ent apparatus.

carrying on their rear ends the inclosing casing 21 of the hereinafter described duplicate optical condenser lenses of the pres- The sliding arrangement just described is adapted to'p'rovide for the ordinary focusing adjustment of the aforesaid lenses, and for a movement of the condenser containing casing 21, wholly. within the "main casing 1, when the apparatus is folded after use, and thus afford a com, pact arrangement of parts for storage and transportation.

I 22 designates a pair of condenser lenses of the usual type mounted in the. upper por-.

tion of the 'inclosi'ng casing- 21 aforesaid with their optical center in line with the optical center of the stereopticon lens or objective 8 above described, individual thereto and in connection therewith comprises the lens system of the stereopticon portion of the present invention] 23 designates transversely arranged guides at the front of the condenser lenses 22 aforesaid, for the movement of I a stereopticon slide 2 1 into and out of the light field of and having an open bottom and an orificed Q or ventilated 'top of any usual and suitable construction. In the present improvement the lamp house 26 is secured to the rear end of the condenser containing casing '21 aforesaid, by vertically arranged interengaging guide flanges 27, so as "to be capable of independent vertical adjustment in' relation to the rear end of the, casing 21, to bring the lamp or other sources of illumination employed to the respective light paths of the apparatus.

'28. designates a lamp carriage' having a limited vertical sliding adjustment in the lamp house, 26 aforesaid, for the purpose of' an initial centering the filament of the lamp 29 m relation to the optical centers of the lens" systems ofthe apparatus, andcompete eating for differences in the vertical position of the filaments in different lamps.

3O designates a horizontal, bottom shelf on the lower end of the.lamp carriage 28 for they support of the incandescent electric lamp 29 used as the source of illumination 1n the present apparatus.

'With the means for effecting a vertical pact adjustment of the lamp house 28 above described, the ready adjustment of the lamp 29 is attained and so. that the central point of illumination'of the lamp filament will 'be in line with one or the other of the secure by Letters Patent, is

1. In an optical projection apparatus, the combination of an inclosing housing, stereopticon and motion picture mechanisms arranged in vertically separated relation in said housing, lens systems individual to said mechanisms and arranged in vertically separated relation, a casing carrying the condenser lenses of the systems, and a lamp house carrying a single source of illumination and arranged .at the rear of the condenser containing casing in a vertically adjustable manner, substantially as set forth.

2. In an optical projection apparatus, the combination ot-an inclosing housing, stereopticon and motion picture mechanisms arranged in vertically separated relation in 1 said housing, lens systems individual to said mechanisms and arranged in vertically separated relation, a casing carrying the condenser lenses of the systems connected in a longitudinally adjustable manner to the inclosing housing, and a lamp house carrying a single source of illumination and arcontaining casing in a vertically adjustable manner, substantially as set forth.

3. In an optical projection apparatus, combination of an inclosing housing carrying a pair of film reel magazines arranged in spaced transverserelation to afford a clear central passage in said housing, and motion picture mechanisms arranged in vertically separated relation in said housing,

lens systems individual to said mechanisms and arranged in vertically separated rela-- tion, a casing carrying the condenser lenses of the systems, and a lamp house carrying a single source of illumination and arranged at the rear of the condenser containing casing in a vertically adjustable manner,'substantially as set forth.

4. In an optical projectlon apparatus, the combination of an inclosing housing carrying a pair of film reel magazines arranged in spaced transverse relation to afford aclear central passage in said housing, stereopticon and motion picture mechanisms arranged in carrying the film feeding mechanism of the stereopticon vertically separated relation in said housing,

lens systems individual to said mechanisms arranged in vertically separated relation, a

casing carrying the condenser lenses of the opticon and motion picture mechanisms arranged! in vertically separated relation in said housing, an upper front portion. movably associated with the said housing and motion picture machine, lens systems individual to said mechanisms arranged 111 vertically separated relation, a casing carrying the condenser. lenses of the systems, and a .lamp house carrying a single source of illumination and arranged at the rear of the condenser carrying casing in a vertically adjustable manner, substantially as set forth.

6. In an optical projection apparatus, the combination of an inclosing housing, stere- ,-opticon and motion picture mechanisms arranged in vertically separated relationin said housing, an upper drop front portion hinged at its lower end to said housing and carrying the film feeding mechanism of the motion picture machine,-lens systems individual to said mechanisms arranged in verticallyseparated relation, a casing carrying the condenser lenses of the systems, and a lamp house carrying a a single source of illumination and arranged at the rear of the condenser carrying casing .in a vertically adjustable manner, substantially as set forth.

7. In an optical projection apparatus, the combination of an inclosing housing, stereopticon and motion picture mechanisms arranged in vertically separated relation in said housing, an upper front' portionmovably associated with said housing and carryingthe film feeding mechanism of the motion picture machine, lens systems individual to said mechanisms arranged in vertically separated relation, a casing carrying the condenser lenses of the systems, and a lamp house carrying a single source of illumination and arranged at the rear end of the condenser carrying casing ina verticall adjustable manner, substantially as set orth.

8. In an optical projection apparatus, the combination of an inclosing housing, storetheopticon and motion picture mechanisms arcarrying the film feeding mechanism of the.

motion picture machine, an upper drop front portion, hinged at its lower end to said housing and caf'rying' the film feeding mechanism 'of the motion pictui'e m'aehine, lens systems individual to said mechanisms ari'anged'ln vertically separated relation, a casing car:

- rying the. condenser'lenses ofthe systems, 1

and a1amp house carrying a single source of illumination and arranged at the rear of the condenser carrying casing in a vertically,

FRANK MGMILLAN. I 

